Distribute our pika stubs under an alternate name (#9358)

Cf. #9246

Author: srittau

stubs/pika/METADATA.toml

@@ -1,5 +1,9 @@
 version = "1.3.*"
-upload = false  # https://github.com/python/typeshed/issues/9246
+stub_distribution = "types-pika-ts"  # https://github.com/python/typeshed/issues/9246
+extra_description = """\
+The `types-pika` package contains alternate, more complete type stubs, that \
+are maintained outside of typeshed.\
+"""
 
 [tool.stubtest]
 ignore_missing_stub = false